Vacuum-pan.



PATENTED JULY 18, 1905 J. ABRAHAM. VAGUUM PAN. APPLIGATLOK FILED 16.18, 1904.

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No. 794,831 PATENTED JULY 13, was! 5. ABRAHAM.

VAGUUM PAN.

APPLIGATIBN FILED AUG.,18, 1964, I

(2/ \T/ g H: e t): C; 1 I} (94 Wumw UNITED STATES Patented July 18, 1905.

PATENT OEEIcE.

JOSEPH ABRAHAM, OF MIL\VAUKF.E, \VlSUONSlN, ASSIGNOR 'lO MIL- WAUKEE EVAPORATOR COMPANY, OF MILWAUKEE, WlSOONSlN, A CORPORATION OF \VISOONSIN.

VACUUM-PAN.

SPECIFICATION forming part of Letters Patent No. 794,831, dated July 18, 1905,

Application filed August 13, 1994.

To all whom it inlay concern/.- 7

Be it known that l, JosErn ABRAHAM, a subject of the King of Great Britain. residing at Milwaukee, in the county of Milwaukee and State of Wisconsin, have invented oertnin new and useful Improvements in Evaporating Apparatus, of which the following 13 a specification, reference being had to the eccompanying drawings, forming a part thereof.

This invention relates more particularly to veouum-evnporotors and may be embodied in single or multiple ell'eet apparatus for treating waste soap-lye to recover glycerin and salt or for condensing or treating various other solutions to obtain various substances they may contain in a dry or concentrated state. Its main objects ere to economize heat, accelerate the eirnnlation and evaporation of the solution or liquid to ho evaporated, and generally to improve the conslruo tion and operation of apparatus of this class.

It consists in certain novel features of eonstruction and in the peculiar arrangement and combinations of parts, as hereinafter particularly described, and pointed out in the claims.

In the accompanying drawings like charactors designate the same parts in the several figures.

Figure l is a vertical section and front elevation of a double-effect evaporating appsratus embodying the invention. Fig. is an enlarged horizontal section on the line 2 2, Fig. I, of one of the evaporators. Fig. 3 is an enlarged vertical section on the line 3 3, Fig. 1, and Fig. 4 is an enlarged vertical tion on the line 4 4, Fig. 1, of a portion of the trap connected with the last evaporator.

For the purpose of illustration the invention is shown as embodied in a douhle'efl'eet apparatus; but it may be embodied in'singlo or multiple eli'ect apparetus comprising a. single evaporating drum or vessel or any desired number of such drums or vessels eonneeted in series.

Referring to the drawings, 2 a. designate two drums or vessels preierabh cylindriral in form and arranged vertically, as shown in Serial No. 221,223.

Fig. 1. They may be conveniently constructed, like steam-boilers, of sheet-metal plates riveted together. Each drum or vessel is divided by horizontal partitions or tube lat-es l; 5 into an eve mating-chamber c at t 1e upper end, a sott ing-chamher d at the lower end, and an intermediate heatingchamber 8.

ff are vertical tubes passing through the heating-chainl'iers e, secured at their ends in the plates 5 and opening into the chambers c and d. The heating-chamber e of the first? cflect evaporator a. has on one side a valvecontrolled live-steain-supply connection g and one or more exhaust-steani-supply connections it it when exhaust-steam is available for the operation of the apparatus. The evaporeting-chainhor c oi the vessel (1. is nonneoted at the top by 3. pi pr 1- with the heatingchamher oi the vessel (1, and an exhaustpipe connects the top of the evaporatingehsmher c of vessel (1 with a vacuum-pump. (Not shown.) In the cxhnusnpipe a condenser is provided consisting oi e verticallyarronged ease ll of somewhat reater diametor than said pipe, having 11 ternating defleeting and spraying lates Z projecting inwardly and downward y from opposite walls thereof, and a Water-supply connection 721, leading into the upper part of the case, as shown in Fig. 1.

On the sides opposite their heat-supply connections the heating-chambers e are connected with the exhaust-pipe below the condenser by pipes n n, rovided with valves 0 0.

A pipe 7), providefwith a valve g, connects with the settlingmhainber (I. of the first-silent evaporator for supplying thereto the solution or liquid to be evaporated, and a pipe r,

rovided with a valve 8, connects with the ottoln of the settling-chamber d at the lower end of the last-eflect evaporator for drawing on the condensed liquid.

A pipe t, provided with a valve 11., connects the settling-chamber d of vessel 0 with the eve orstingmhaniber c of vessel (1,.

T in bottom or lower end of vessel a has an opening which closed by a removable cover or plate 1, and with the bottom or lower end of the vessel a" a trap w is connected, the connection between it and said vessel bOlIlg provided with a valve This trap has in one side an opening which is closed by a removable late or cover 1? and is provided below said opening, as shown in Fig. 4, with a strainer y, which may be constructed of layers of sacking or other suitable fibrous material held between perforated metal )lates or screens. The bottom of the trap 1s connected below this strainer by a pipe 2, having a valve 2, with the pi )c t leading into the evaporating-chamber c ot vessel (1.. This connection may, however, be made independently ol the connection between the settling-chamber d of vessel (1 and the evaporating-chainber oi vessel (1'. Steam or other supply pipes 3 and 4 are preferably conneeted with the upper part of the trap, which is also preferably provided with a sightglass 5 for observing the nature and condition of its contents.

To utilize to the fullest degree the heat contained in the steam or other beating medium supplied to the apparatus and to accelerate the circulation and evaporation of the solution or liquid to be evaporated, balllcplates 6 are provided between the several rows of tubes f, which are arranged crosswise of the heating-chainbers e between their heat-supply and outlet connections. These plates terminate alternately at their upper and lower edges short of the tubcplates 1, to which they are attached at their other edges, thereby Forming zigzag or sinuous passages for the heating medium running lengthwise of the tubes.

Deflecting-plates 7 7, attached to the walls of the vessels (1 a, project inwardly therefrom over the upper ends of the tubesfneap est the heat-supply coimections.

improved apparatus operates as lollows. The vessels (1 a being supplied with solution or liquid to be (waporated, steam is admitted to the heating-elmmber c of vessel (1 through one or more oi the supply connections gand la, the upper part of the vessel c is exhausted by the operation of the vacuumpump connected therewith through the pipe j and the condenser, and the valve '21 is adjusted to maintain a higher or stronger vacuuIn in vessel (1 than in vessel a, according to the usual practice in multiple-ell'eet apparatus of this class. The steam entering the first heathig-chamber llows back and forth. lengthwise of and in contact with the tubesj'between the battle-plates 6, rapidly giving up its heat to said tubes and the solution or liquid contained therein and finallv escapes from the opposite side of said cham her through the pipe it into the main exhaust-pipe The steam traversing the tubes f their entire length rapidly communicates its heat thereto and is nearly, if not completely, spent before it reaches the last rows of tubes. The first rows of tubes being thus subjected to the greatest heat, a strong upward current of the solution or liquid is induced through them, resulting in a downward current through the cooler tubes toward the opposite side of the chamber and a rapid circulation of the solution back and forth between the evaporating and settling chambers c and d, indicated by the full line arrows on Fig. l. The sinuous course of the steam in its passage through the heatingchamber c is indicated by dotted arrows on Fig. l. The steam or hot vapor generated in the lirst-eiTect evaporator is conducted through the pipe i into the heating-chainber of the sccond-etl'm't evaporator and passes in. like manner in a zigzag orsinuous course along the tubcsfbetween the ballle-plates (5 in its heating-chamber e, escaping therefrom in a spent condition through the pipe into the main exhaust-pipe The lower boiling- )oint of the solution or liquid in the vessel (1, by reason of the higher or stronger vacuum maintained therein, admits of employing the steam or vapor produced by the evaporation of the solution or liquid in the preceding vessel as the heating medium for the last or next vessel. The denser part of the solution or liquid in the lirst vessel (I is drawn from the settling-chainber at through the pipe I into the evaporating-chamber c of vessel (1. and the condensed liquid settling in chamber rl of vessel (1 is drawn oil from time to time through the pipe I. Solid matter, such as salt, in the treatment of waste soap-lye pre cipitated in the settling-chamber (1 ol the last-ellect evaporator is swept by the circulation of the solution in its passage through said chamber into the trap to, the valve .11 being lelt wide open. When a sullicient quantity of salt or other solid matter has accumu lated in the trap, as observed through the sight-glass 5, the valves 11 and .1! are closed and the valve 12 is opened, thus permitting the high vacuum maintained in chamber c to draw the liquid from the salt or other solid matter through the strainer 31 back into said chamber. The valve 2 is now closed, the cover 4r removed, and the salt or other matter withdrawn from the trap. It necessary or desirable, the salt or other mattcrcaught in the trap w maybe washed or cleansed before its removal therefrom by theadmission of steam or water through the connection 3 or 4. The steam or vapor produced by evaporation in the second or last chamber e, escaping through the pipe j into the upper end of the condenser, is directed back and forth by the plates 1 and mingled with the cool water supplied to the condenser through the pipe in and beaten into a spray by its projection against said plates. The steam or vapor being thus rapidly emulensed helps to produce and maintain the high vacuum required in the last evaporator,

The circulation of steam and the relative temperatures prmluced and maintained in the heating eluinibers e of the two or several connected evaporators are governed by the valves :9 in the exhaust connections and by the valve g in the main supply connection. The relative degrees oi vacuum maintained in the evaporatiug ehanlbers are controlled by the valve of the last evaporator and t the valve u, well by the operation of the vacuum-pinup connected with the exl1aust pipe and the regulation of the cool injectionvrater to the condenser through the pipe in.

Various changes in. the details of rr'uistiiitation and in the arrangement of parts may he made without departing from the principle and intended scope of the invention.

it claim 1. ln evaporating apparatus the combination of a elosed vessel having a heating-chainher between evaporating and settling chainhers, tubes passing through the heatingehaiuber and Oltlllllg at the ends into the evaporating and settling chambers, inlet and outlet connections with opposite sides of the heating-chamber for the heating medium, and battle plates extending transversely across said heating-chamber between its inlet and outlet connections and between the rows of tubes therein and terminating alternately short of the partitions at opposite ends of said tubes, thereby Forming a zigzag passage for the heating medium back and lorth lengthwise ot the tubes, substantially as described.

2. ln (Waporating apparatus the combination of a closed vessel divided by horizontal tube-plates into m'aporating, heating and settling chambers, inlet and outlet conneclions with opposite sides of said heatingchainher for the heating medium, tubes passing vertically through said heating-chamber and opening at the ends into the evairiorating and settling chambers lmllle-plates extending across the heatlug-chamber between its inlet and outlet connections and between successive rows of tubes and terminating alternately short of the upper and lower tube plates, and a deflector pro ieeting into the cvaporating-chamber over the upper ends of the tubes nearest the inlet connection, substantially as described.

3. In evaporating apparatus the combination of a closed vessel having evaporating. heating and settling chambers, connections with oppositesides of the heating-ehan'iber for admission and discharge of the heating medium, tubes passing through said heatingehainber and opening at the ends into the, evaporating and settling chambers, battleplatcs extending across the heating-chamber between its inlet and outlet connections and between sueeessivo rows of tubes and tern1i hating alternately short of the top and bottom walls of said chamber, and an exhaust connection leading out oi said evaporating chamber substantially described.

s, in evaporating apparatus the eoinbinalieu of closed vessel divided by horizontal tube-plates into evaporating, heating and settling chambers, tubes passing vertically through the heating-chamber and opening at their upper ends into the ex-nporating-chamber and at their lower ends into the settlingehaniber, an exhaust conneetion leading out of the upper part of the evaporating-eluiimber, inlet and outlet connections for the heatin; medium on opposite sides of the heating-chamber, Vaire-controlled liquid supply and discharge connections leading into and out of said vessel, and vertical bathe-plates extending across the heating-chamber be tween its inlet and outlet connections and between successive rows of tubes and tenninating alteri'iately short of the upper and lower tube-plates thereby forming a Zigzag passage for the heating medium up and down along said tubes, substantially as described.

5. ln evaporating apparatus the combination of a number of closed vessels each divided by horizontal tube-plates into eva 0- rating heating and settling chambers, to )es passing vertically through the heatingchambers and opening at their upper ends into the evapm'atiug chambers and at their lower ends into the settllug-chambers an exhaust connection leading, out of the upper part of the last evilpointing-chainber, a eounection leading from the upper part of the evaporating-chamber of each preceding vessel into the hea ting-chamber o the next suc seeding vessel a connection with the heatingchainber oi? the first vessel for supplying a heating medium thereto valve controlled outlet connections with the liesting=ehain bers opposite their heat-supply connections, a valve-eontrolled connection leading from the settlbig-chamber of each preceding ves sel into the rvaporatirig-chamber oi the next vessel, and vertical battle plates extending across the heating-chambers between their heat supply and outlet connections and be tween successive rows of tubes and terminating alternately at their upper and lowerexhaust connection con'iprising a condenser loading out of the upper part of the last chamber of each preceding vessel into the i heatin -chamber of the next succeedin vessel, a valve-controlled heat-supply connection with the first heating-chamber, valvecontrolled outlet eonl'leetiol'ls for the several heating chambers, a valvecontrolled con nection leading from the scttlingclm1nber of each preceding vessel into the evaporatingchember of the next succeeding vessel, valvecontrollcd li( uid supplv and discharge connections wit 1 the setthug-chambers of the first and last vessels respectively, and a trap provided with a strainer and having a valvecontrolled connection above the strainer with the settling-chamber and a valve-controlled connection below the strainer with the evaporating-ch21mber of the last 'essel, substantially as described.

In witness whereof .1. hereto aflix my signature in presence of two witnesses.

JOSEPH ABRAHAM. W'itnes.

(hms. L. (loss, BERNARD U. RoLoFF. 

